Evaluation of wind-driven natural ventilation of single-span greenhouses built on reclaimed coastal land

Lee, Sang-yeon; Lee, In-Bok; Kim, Rack-woo

doi:10.1016/j.biosystemseng.2018.04.015

Cited by 46 publications

(25 citation statements)

References 43 publications

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“…S. Lee et al (2018) calculated the ventilation rates according to various wind directions (0 , 45 , and 90 ) and wind speeds (1.0, 2.5, and 5.5 m s À1 ) using a commercial CFD code and validated the simulated results through wind tunnel measurements. The same structure and wind conditions were modelled using the HNVR-SYS with a mesh level of three and the RNG keε turbulence model; the results are in good agreement with those by S. Lee et al (2018), showing an average relative error of 11.8% and an RMSE error of 0.43 min À1 (Fig. 9).…”

Section: Nv Greenhousesupporting

confidence: 69%

“…Fig. 9 e Comparison of ventilation rates obtained by the reference (S. Lee et al, 2018) and HNVR-SYS of this study. WD stands for wind direction, and 90 indicates the wind blowing perpendicular to the side vent.…”

Section: Conclusion and Further Developmentsmentioning

confidence: 92%

“…;Lee et al, 2013;S. ;Lee, Lee, & Kim, 2018;Fallon, & Dodd, 2007). While CFD simulations have been used in many different ventilation analyses, their results vary vastly in accuracy according to the researchers' skills and abilities.…”

Section: Introductionmentioning

confidence: 99%

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Computational fluid dynamics for non-experts: Development of a user-friendly CFD simulator (HNVR-SYS) for natural ventilation design applications

Kim

Hong

Norton

et al. 2020

Biosystems Engineering

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Measuring the ventilation rate is crucial to ensuring the control of thermal comfort, energy saving, and emission of pollutants in greenhouses and animal houses. This is more difficult in naturally ventilated (NV) buildings because of the dynamic and complex air flow patterns caused by wind and buoyancy effects. In this study, a user-friendly computational fluid dynamics (CFD) simulator is developed to analyse internal airflow patterns and ventilation rates of NV buildings, with the initial focus on agricultural buildings. The userfriendly CFD automation program, developed using the freely available open-source OpenFOAM and ParaView visualization toolkit, is aimed at non-CFD experts to help them obtain practical CFD solutions quickly. Users simply input building and ventilating configurations, outdoor wind conditions, topographical conditions, and information regarding plants or animals through user-friendly graphical user interfaces. General CFD processes are automated, and the quality of each process is controlled. After executing the program, a three-dimensional interactive visualization module is used for post-processing. It can ensure the flexibility and manageability of the model by automating predeveloped procedures in a user-interactive manner, thereby reducing time and effort. This paper describes the development process of automation interfaces.

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Section: Nv Greenhousesupporting

confidence: 69%

Section: Conclusion and Further Developmentsmentioning

confidence: 92%

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Computational fluid dynamics for non-experts: Development of a user-friendly CFD simulator (HNVR-SYS) for natural ventilation design applications

Kim

Hong

Norton

et al. 2020

Biosystems Engineering

Self Cite

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“…Once the CFD simulation model was validated, it was considered an agile and accurate tool to investigate the effects of increased ventilation surface on thermal distribution and air flow patterns in the greenhouse, ventilation rates were quantified through the widely used mass flow rate method. [41]. In accordance with the objective of this research, 7 simulation scenarios were proposed, including reference scenario S1.…”

Section: Numerical Simulations and Validation Of The Numerical Modelmentioning

confidence: 98%

CFD Simulation of the Increase of the Roof Ventilation Area in a Traditional Colombian Greenhouse: Effect on Air Flow Patterns and Thermal Behavior

Villagrán¹,

Bojacá²

2019

IJHT

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The protected horticultural production in tropical countries such as Colombia takes place mainly under passively ventilated greenhouses. The major drawback of the traditional Colombian greenhouse is its low ventilation rate leading to inadequate microclimates. The purpose of this study was to evaluate the airflow behavior, ventilation rates and thermal distribution effects of a commercial-size greenhouse, due to the gradual increase of the roof ventilation areas. A numerical simulation model was developed under a computational fluid dynamics (CFD) approach following an experimental validation of the simulated scenarios. The results showed that increasing the roof ventilation areas reduced the internal average temperatures by up to 16 %, improved the temperature homogeneity and increased the ventilation rates by up to 191 % with respect to the reference scenario. The findings of this research may serve as a basis to develop alternative greenhouse designs that consider increasing the ventilation areas but within the low-tech context that constrains innovation in the Colombian horticultural sector.

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“…In Colombia the rose is produced in productive systems under passive greenhouses, where the climate control strategy is based exclusively on the use of the natural ventilation phenomenon, which being a simple and efficient method of climate control is economically viable (Lee et al, 2018). Natural ventilation is still widely used in greenhouses in countries such as Spain, China, Mexico and Colombia (McCartney and Lefsrud, 2018).…”

Section: Introductionmentioning

confidence: 99%

Study of natural ventilation in a Gothic multi-tunnel greenhouse designed to produce rose (Rosa spp.) in the high-Andean tropic

Villagrán

Bojacá

2019

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In tropical regions the production of ornamentals is developed exclusively in naturally ventilated plastic greenhouses, which sometimes leads to inappropriate microclimates with high temperatures and humidity that limit the productive development of plants. The aim of this work was to study air flows, temperature distribution and relative humidity inside an alternative greenhouse designed to produce rose (Rosa spp.). Three configurations of ventilation, side ventilation (SV), roof ventilation (RC) and combined roof and side ventilation (RSV) were analyzed. The methodological development was based on the use of a previously validated CFD-2D numerical simulation model, which showed an adequate fit between the measured and simulated data, obtaining MAE and RMSE values for temperature and relative humidity of 0.44 and 0.47 °C, 3.99% and 4.04% respectively. The results obtained for the predominant climatic conditions of the study region showed that the highest ventilation rates were obtained for RSV, with values of 0.044 and 0.182 m 3 m -2 s -1 , this ventilation efficiency propitiated the generation of a homogeneous microclimate, with temperature and relative humidity values adequate to produce rose (Rosa spp). ResumoEstudo da ventilação natural em uma estufa gótica multi-túnel projetada para produzir rosa (Rosa spp.) no trópico alto-andino. Nas regiões tropicais, a produção de plantas ornamentais é desenvolvida exclusivamente em estufas plásticas ventiladas de forma natural, o que significa que em algumas ocasiões microclimas inadequados são gerados com altas temperaturas e umidade que limitam o desenvolvimento produtivo das plantas. O objetivo deste trabalho foi estudar os fluxos de ar, a distribuição de temperatura e umidade relativa do ar dentro de uma estufa alternativa projetada para a produção de rosa (Rosa spp.). Três configurações de ventilação, ventilação lateral (SV), ventilação de telhado (RC) e telhado combinado e ventilação lateral (RSV) foram analisadas. O desenvolvimento metodológico baseou-se na utilização de um modelo de simulação numérica CFD-2D previamente validado, que mostrou um ajuste adequado entre os dados medidos e simulados, obtenção de valores de MAE e RMSE para temperatura e umidade relativa de 0,44 e 0,47 ° C, 3,99 e 4,04% respectivamente. Os resultados obtidos para as condições climáticas predominantes da região de estudo mostraram que as maiores taxas de ventilação foram obtidas para o RSV, com valores de 0,044 e 0,182 m 3 m -2 s -1 , essa eficiência de ventilação propiciou a geração de um microclima homogêneo, com valores de temperatura e umidade relativa adequados para a produção de rosa (Rosa spp.). Palavras-chave: Microclima, taxa de ventilação, simulação de CFD, temperatura, umidade relativa, volumes finitos.

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Evaluation of wind-driven natural ventilation of single-span greenhouses built on reclaimed coastal land

Cited by 46 publications

References 43 publications

Computational fluid dynamics for non-experts: Development of a user-friendly CFD simulator (HNVR-SYS) for natural ventilation design applications

Computational fluid dynamics for non-experts: Development of a user-friendly CFD simulator (HNVR-SYS) for natural ventilation design applications

CFD Simulation of the Increase of the Roof Ventilation Area in a Traditional Colombian Greenhouse: Effect on Air Flow Patterns and Thermal Behavior

Study of natural ventilation in a Gothic multi-tunnel greenhouse designed to produce rose (Rosa spp.) in the high-Andean tropic

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